Branch, M.L.; Hayward, P.J. (2007). The Bryozoa of subantarctic Marion and Prince Edward Islands: illustrated keys to the species and results of the 1982-1989 University of Cape Town surveys. Afr. J. Mar. Sci. 29(1): 1-24

Hayward, P.J. (2001). Entoprocta, in: Costello, M.J. et al. (Ed.) European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 179-180, more

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